128305313 has 4 divisors (see below), whose sum is σ = 128673300. Its totient is φ = 127937328.

The previous prime is 128305297. The next prime is 128305319. The reversal of 128305313 is 313503821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 313503821 = 877 ⋅357473.

It can be written as a sum of positive squares in 2 ways, for example, as 106337344 + 21967969 = 10312^2 + 4687^2 .

It is a cyclic number.

It is not a de Polignac number, because 128305313 - 2⁴ = 128305297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128305319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 183470 + ... + 184167.

It is an arithmetic number, because the mean of its divisors is an integer number (32168325).

Almost surely, 2^128305313 is an apocalyptic number.

It is an amenable number.

128305313 is a deficient number, since it is larger than the sum of its proper divisors (367987).

128305313 is an equidigital number, since it uses as much as digits as its factorization.

128305313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 367986.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 128305313 is about 11327.1935182551. The cubic root of 128305313 is about 504.3687999936.

The spelling of 128305313 in words is "one hundred twenty-eight million, three hundred five thousand, three hundred thirteen".